﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace wd_24_string_cannot_v1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        string global2 = " cannot connect";
        string find2 = "cannot";

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            int index = global2.IndexOf(find2); // 成功返回子串的索引值
            string s1 = string.Format("{0}", index);
            MessageBox.Show(s1);
        }
    }
}
